libeap/src/eap_peer/eap_fast.c

   1 /*
   2  * EAP peer method: EAP-FAST (RFC 4851)
   3  * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "crypto/tls.h"
  13 #include "crypto/sha1.h"
  14 #include "eap_common/eap_tlv_common.h"
  15 #include "eap_i.h"
  16 #include "eap_tls_common.h"
  17 #include "eap_config.h"
  18 #include "eap_fast_pac.h"
  19
  20 #ifdef EAP_FAST_DYNAMIC
  21 #include "eap_fast_pac.c"
  22 #endif /* EAP_FAST_DYNAMIC */
  23
  24 /* TODO:
  25  * - test session resumption and enable it if it interoperates
  26  * - password change (pending mschapv2 packet; replay decrypted packet)
  27  */
  28
  29
  30 static void eap_fast_deinit(struct eap_sm *sm, void *priv);
  31
  32
  33 struct eap_fast_data {
  34         struct eap_ssl_data ssl;
  35
  36         int fast_version;
  37
  38         const struct eap_method *phase2_method;
  39         void *phase2_priv;
  40         int phase2_success;
  41
  42         struct eap_method_type phase2_type;
  43         struct eap_method_type *phase2_types;
  44         size_t num_phase2_types;
  45         int resuming; /* starting a resumed session */
  46         struct eap_fast_key_block_provisioning *key_block_p;
  47 #define EAP_FAST_PROV_UNAUTH 1
  48 #define EAP_FAST_PROV_AUTH 2
  49         int provisioning_allowed; /* Allowed PAC provisioning modes */
  50         int provisioning; /* doing PAC provisioning (not the normal auth) */
  51         int anon_provisioning; /* doing anonymous (unauthenticated)
  52                                 * provisioning */
  53         int session_ticket_used;
  54
  55         u8 key_data[EAP_FAST_KEY_LEN];
  56         u8 *session_id;
  57         size_t id_len;
  58         u8 emsk[EAP_EMSK_LEN];
  59         int success;
  60
  61         struct eap_fast_pac *pac;
  62         struct eap_fast_pac *current_pac;
  63         size_t max_pac_list_len;
  64         int use_pac_binary_format;
  65
  66         u8 simck[EAP_FAST_SIMCK_LEN];
  67         int simck_idx;
  68
  69         struct wpabuf *pending_phase2_req;
  70         struct wpabuf *pending_resp;
  71 };
  72
  73
  74 static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
  75                                       const u8 *client_random,
  76                                       const u8 *server_random,
  77                                       u8 *master_secret)
  78 {
  79         struct eap_fast_data *data = ctx;
  80
  81         wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
  82
  83         if (client_random == NULL || server_random == NULL ||
  84             master_secret == NULL) {
  85                 wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket failed - fall "
  86                            "back to full TLS handshake");
  87                 data->session_ticket_used = 0;
  88                 if (data->provisioning_allowed) {
  89                         wpa_printf(MSG_DEBUG, "EAP-FAST: Try to provision a "
  90                                    "new PAC-Key");
  91                         data->provisioning = 1;
  92                         data->current_pac = NULL;
  93                 }
  94                 return 0;
  95         }
  96
  97         wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket", ticket, len);
  98
  99         if (data->current_pac == NULL) {
 100                 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key available for "
 101                            "using SessionTicket");
 102                 data->session_ticket_used = 0;
 103                 return 0;
 104         }
 105
 106         eap_fast_derive_master_secret(data->current_pac->pac_key,
 107                                       server_random, client_random,
 108                                       master_secret);
 109
 110         data->session_ticket_used = 1;
 111
 112         return 1;
 113 }
 114
 115
 116 static void eap_fast_parse_phase1(struct eap_fast_data *data,
 117                                   const char *phase1)
 118 {
 119         const char *pos;
 120
 121         pos = os_strstr(phase1, "fast_provisioning=");
 122         if (pos) {
 123                 data->provisioning_allowed = atoi(pos + 18);
 124                 wpa_printf(MSG_DEBUG, "EAP-FAST: Automatic PAC provisioning "
 125                            "mode: %d", data->provisioning_allowed);
 126         }
 127
 128         pos = os_strstr(phase1, "fast_max_pac_list_len=");
 129         if (pos) {
 130                 data->max_pac_list_len = atoi(pos + 22);
 131                 if (data->max_pac_list_len == 0)
 132                         data->max_pac_list_len = 1;
 133                 wpa_printf(MSG_DEBUG, "EAP-FAST: Maximum PAC list length: %lu",
 134                            (unsigned long) data->max_pac_list_len);
 135         }
 136
 137         pos = os_strstr(phase1, "fast_pac_format=binary");
 138         if (pos) {
 139                 data->use_pac_binary_format = 1;
 140                 wpa_printf(MSG_DEBUG, "EAP-FAST: Using binary format for PAC "
 141                            "list");
 142         }
 143 }
 144
 145
 146 static void * eap_fast_init(struct eap_sm *sm)
 147 {
 148         struct eap_fast_data *data;
 149         struct eap_peer_config *config = eap_get_config(sm);
 150
 151         if (config == NULL)
 152                 return NULL;
 153
 154         data = os_zalloc(sizeof(*data));
 155         if (data == NULL)
 156                 return NULL;
 157         data->fast_version = EAP_FAST_VERSION;
 158         data->max_pac_list_len = 10;
 159
 160         if (config->phase1)
 161                 eap_fast_parse_phase1(data, config->phase1);
 162
 163         if (eap_peer_select_phase2_methods(config, "auth=",
 164                                            &data->phase2_types,
 165                                            &data->num_phase2_types) < 0) {
 166                 eap_fast_deinit(sm, data);
 167                 return NULL;
 168         }
 169
 170         data->phase2_type.vendor = EAP_VENDOR_IETF;
 171         data->phase2_type.method = EAP_TYPE_NONE;
 172
 173         if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_FAST)) {
 174                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
 175                 eap_fast_deinit(sm, data);
 176                 return NULL;
 177         }
 178
 179         if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
 180                                                  eap_fast_session_ticket_cb,
 181                                                  data) < 0) {
 182                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
 183                            "callback");
 184                 eap_fast_deinit(sm, data);
 185                 return NULL;
 186         }
 187
 188         /*
 189          * The local RADIUS server in a Cisco AP does not seem to like empty
 190          * fragments before data, so disable that workaround for CBC.
 191          * TODO: consider making this configurable
 192          */
 193         if (tls_connection_enable_workaround(sm->ssl_ctx, data->ssl.conn)) {
 194                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to enable TLS "
 195                            "workarounds");
 196         }
 197
 198         if (!config->pac_file) {
 199                 wpa_printf(MSG_INFO, "EAP-FAST: No PAC file configured");
 200                 eap_fast_deinit(sm, data);
 201                 return NULL;
 202         }
 203
 204         if (data->use_pac_binary_format &&
 205             eap_fast_load_pac_bin(sm, &data->pac, config->pac_file) < 0) {
 206                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file");
 207                 eap_fast_deinit(sm, data);
 208                 return NULL;
 209         }
 210
 211         if (!data->use_pac_binary_format &&
 212             eap_fast_load_pac(sm, &data->pac, config->pac_file) < 0) {
 213                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to load PAC file");
 214                 eap_fast_deinit(sm, data);
 215                 return NULL;
 216         }
 217         eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
 218
 219         if (data->pac == NULL && !data->provisioning_allowed) {
 220                 wpa_printf(MSG_INFO, "EAP-FAST: No PAC configured and "
 221                            "provisioning disabled");
 222                 eap_fast_deinit(sm, data);
 223                 return NULL;
 224         }
 225
 226         return data;
 227 }
 228
 229
 230 static void eap_fast_deinit(struct eap_sm *sm, void *priv)
 231 {
 232         struct eap_fast_data *data = priv;
 233         struct eap_fast_pac *pac, *prev;
 234
 235         if (data == NULL)
 236                 return;
 237         if (data->phase2_priv && data->phase2_method)
 238                 data->phase2_method->deinit(sm, data->phase2_priv);
 239         os_free(data->phase2_types);
 240         os_free(data->key_block_p);
 241         eap_peer_tls_ssl_deinit(sm, &data->ssl);
 242
 243         pac = data->pac;
 244         prev = NULL;
 245         while (pac) {
 246                 prev = pac;
 247                 pac = pac->next;
 248                 eap_fast_free_pac(prev);
 249         }
 250         os_memset(data->key_data, 0, EAP_FAST_KEY_LEN);
 251         os_memset(data->emsk, 0, EAP_EMSK_LEN);
 252         os_free(data->session_id);
 253         wpabuf_free(data->pending_phase2_req);
 254         wpabuf_free(data->pending_resp);
 255         os_free(data);
 256 }
 257
 258
 259 static int eap_fast_derive_msk(struct eap_fast_data *data)
 260 {
 261         if (eap_fast_derive_eap_msk(data->simck, data->key_data) < 0 ||
 262             eap_fast_derive_eap_emsk(data->simck, data->emsk) < 0)
 263                 return -1;
 264         data->success = 1;
 265         return 0;
 266 }
 267
 268
 269 static int eap_fast_derive_key_auth(struct eap_sm *sm,
 270                                     struct eap_fast_data *data)
 271 {
 272         u8 *sks;
 273
 274         /* RFC 4851, Section 5.1:
 275          * Extra key material after TLS key_block: session_key_seed[40]
 276          */
 277
 278         sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
 279                                   EAP_FAST_SKS_LEN);
 280         if (sks == NULL) {
 281                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
 282                            "session_key_seed");
 283                 return -1;
 284         }
 285
 286         /*
 287          * RFC 4851, Section 5.2:
 288          * S-IMCK[0] = session_key_seed
 289          */
 290         wpa_hexdump_key(MSG_DEBUG,
 291                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 292                         sks, EAP_FAST_SKS_LEN);
 293         data->simck_idx = 0;
 294         os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
 295         os_free(sks);
 296         return 0;
 297 }
 298
 299
 300 static int eap_fast_derive_key_provisioning(struct eap_sm *sm,
 301                                             struct eap_fast_data *data)
 302 {
 303         os_free(data->key_block_p);
 304         data->key_block_p = (struct eap_fast_key_block_provisioning *)
 305                 eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
 306                                     sizeof(*data->key_block_p));
 307         if (data->key_block_p == NULL) {
 308                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
 309                 return -1;
 310         }
 311         /*
 312          * RFC 4851, Section 5.2:
 313          * S-IMCK[0] = session_key_seed
 314          */
 315         wpa_hexdump_key(MSG_DEBUG,
 316                         "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
 317                         data->key_block_p->session_key_seed,
 318                         sizeof(data->key_block_p->session_key_seed));
 319         data->simck_idx = 0;
 320         os_memcpy(data->simck, data->key_block_p->session_key_seed,
 321                   EAP_FAST_SIMCK_LEN);
 322         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
 323                         data->key_block_p->server_challenge,
 324                         sizeof(data->key_block_p->server_challenge));
 325         wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
 326                         data->key_block_p->client_challenge,
 327                         sizeof(data->key_block_p->client_challenge));
 328         return 0;
 329 }
 330
 331
 332 static int eap_fast_derive_keys(struct eap_sm *sm, struct eap_fast_data *data)
 333 {
 334         int res;
 335
 336         if (data->anon_provisioning)
 337                 res = eap_fast_derive_key_provisioning(sm, data);
 338         else
 339                 res = eap_fast_derive_key_auth(sm, data);
 340         return res;
 341 }
 342
 343
 344 static int eap_fast_init_phase2_method(struct eap_sm *sm,
 345                                        struct eap_fast_data *data)
 346 {
 347         data->phase2_method =
 348                 eap_peer_get_eap_method(data->phase2_type.vendor,
 349                                         data->phase2_type.method);
 350         if (data->phase2_method == NULL)
 351                 return -1;
 352
 353         if (data->key_block_p) {
 354                 sm->auth_challenge = data->key_block_p->server_challenge;
 355                 sm->peer_challenge = data->key_block_p->client_challenge;
 356         }
 357         sm->init_phase2 = 1;
 358         data->phase2_priv = data->phase2_method->init(sm);
 359         sm->init_phase2 = 0;
 360         sm->auth_challenge = NULL;
 361         sm->peer_challenge = NULL;
 362
 363         return data->phase2_priv == NULL ? -1 : 0;
 364 }
 365
 366
 367 static int eap_fast_select_phase2_method(struct eap_fast_data *data, u8 type)
 368 {
 369         size_t i;
 370
 371         /* TODO: TNC with anonymous provisioning; need to require both
 372          * completed MSCHAPv2 and TNC */
 373
 374         if (data->anon_provisioning && type != EAP_TYPE_MSCHAPV2) {
 375                 wpa_printf(MSG_INFO, "EAP-FAST: Only EAP-MSCHAPv2 is allowed "
 376                            "during unauthenticated provisioning; reject phase2"
 377                            " type %d", type);
 378                 return -1;
 379         }
 380
 381 #ifdef EAP_TNC
 382         if (type == EAP_TYPE_TNC) {
 383                 data->phase2_type.vendor = EAP_VENDOR_IETF;
 384                 data->phase2_type.method = EAP_TYPE_TNC;
 385                 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
 386                            "vendor %d method %d for TNC",
 387                            data->phase2_type.vendor,
 388                            data->phase2_type.method);
 389                 return 0;
 390         }
 391 #endif /* EAP_TNC */
 392
 393         for (i = 0; i < data->num_phase2_types; i++) {
 394                 if (data->phase2_types[i].vendor != EAP_VENDOR_IETF ||
 395                     data->phase2_types[i].method != type)
 396                         continue;
 397
 398                 data->phase2_type.vendor = data->phase2_types[i].vendor;
 399                 data->phase2_type.method = data->phase2_types[i].method;
 400                 wpa_printf(MSG_DEBUG, "EAP-FAST: Selected Phase 2 EAP "
 401                            "vendor %d method %d",
 402                            data->phase2_type.vendor,
 403                            data->phase2_type.method);
 404                 break;
 405         }
 406
 407         if (type != data->phase2_type.method || type == EAP_TYPE_NONE)
 408                 return -1;
 409
 410         return 0;
 411 }
 412
 413
 414 static int eap_fast_phase2_request(struct eap_sm *sm,
 415                                    struct eap_fast_data *data,
 416                                    struct eap_method_ret *ret,
 417                                    struct eap_hdr *hdr,
 418                                    struct wpabuf **resp)
 419 {
 420         size_t len = be_to_host16(hdr->length);
 421         u8 *pos;
 422         struct eap_method_ret iret;
 423         struct eap_peer_config *config = eap_get_config(sm);
 424         struct wpabuf msg;
 425
 426         if (len <= sizeof(struct eap_hdr)) {
 427                 wpa_printf(MSG_INFO, "EAP-FAST: too short "
 428                            "Phase 2 request (len=%lu)", (unsigned long) len);
 429                 return -1;
 430         }
 431         pos = (u8 *) (hdr + 1);
 432         wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 Request: type=%d", *pos);
 433         if (*pos == EAP_TYPE_IDENTITY) {
 434                 *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1);
 435                 return 0;
 436         }
 437
 438         if (data->phase2_priv && data->phase2_method &&
 439             *pos != data->phase2_type.method) {
 440                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 EAP sequence - "
 441                            "deinitialize previous method");
 442                 data->phase2_method->deinit(sm, data->phase2_priv);
 443                 data->phase2_method = NULL;
 444                 data->phase2_priv = NULL;
 445                 data->phase2_type.vendor = EAP_VENDOR_IETF;
 446                 data->phase2_type.method = EAP_TYPE_NONE;
 447         }
 448
 449         if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
 450             data->phase2_type.method == EAP_TYPE_NONE &&
 451             eap_fast_select_phase2_method(data, *pos) < 0) {
 452                 if (eap_peer_tls_phase2_nak(data->phase2_types,
 453                                             data->num_phase2_types,
 454                                             hdr, resp))
 455                         return -1;
 456                 return 0;
 457         }
 458
 459         if ((data->phase2_priv == NULL &&
 460              eap_fast_init_phase2_method(sm, data) < 0) ||
 461             data->phase2_method == NULL) {
 462                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize "
 463                            "Phase 2 EAP method %d", *pos);
 464                 ret->methodState = METHOD_DONE;
 465                 ret->decision = DECISION_FAIL;
 466                 return -1;
 467         }
 468
 469         os_memset(&iret, 0, sizeof(iret));
 470         wpabuf_set(&msg, hdr, len);
 471         *resp = data->phase2_method->process(sm, data->phase2_priv, &iret,
 472                                              &msg);
 473         if (*resp == NULL ||
 474             (iret.methodState == METHOD_DONE &&
 475              iret.decision == DECISION_FAIL)) {
 476                 ret->methodState = METHOD_DONE;
 477                 ret->decision = DECISION_FAIL;
 478         } else if ((iret.methodState == METHOD_DONE ||
 479                     iret.methodState == METHOD_MAY_CONT) &&
 480                    (iret.decision == DECISION_UNCOND_SUCC ||
 481                     iret.decision == DECISION_COND_SUCC)) {
 482                 data->phase2_success = 1;
 483         }
 484
 485         if (*resp == NULL && config &&
 486             (config->pending_req_identity || config->pending_req_password ||
 487              config->pending_req_otp || config->pending_req_new_password)) {
 488                 wpabuf_free(data->pending_phase2_req);
 489                 data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
 490         } else if (*resp == NULL)
 491                 return -1;
 492
 493         return 0;
 494 }
 495
 496
 497 static struct wpabuf * eap_fast_tlv_nak(int vendor_id, int tlv_type)
 498 {
 499         struct wpabuf *buf;
 500         struct eap_tlv_nak_tlv *nak;
 501         buf = wpabuf_alloc(sizeof(*nak));
 502         if (buf == NULL)
 503                 return NULL;
 504         nak = wpabuf_put(buf, sizeof(*nak));
 505         nak->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY | EAP_TLV_NAK_TLV);
 506         nak->length = host_to_be16(6);
 507         nak->vendor_id = host_to_be32(vendor_id);
 508         nak->nak_type = host_to_be16(tlv_type);
 509         return buf;
 510 }
 511
 512
 513 static struct wpabuf * eap_fast_tlv_result(int status, int intermediate)
 514 {
 515         struct wpabuf *buf;
 516         struct eap_tlv_intermediate_result_tlv *result;
 517         buf = wpabuf_alloc(sizeof(*result));
 518         if (buf == NULL)
 519                 return NULL;
 520         wpa_printf(MSG_DEBUG, "EAP-FAST: Add %sResult TLV(status=%d)",
 521                    intermediate ? "Intermediate " : "", status);
 522         result = wpabuf_put(buf, sizeof(*result));
 523         result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 524                                         (intermediate ?
 525                                          EAP_TLV_INTERMEDIATE_RESULT_TLV :
 526                                          EAP_TLV_RESULT_TLV));
 527         result->length = host_to_be16(2);
 528         result->status = host_to_be16(status);
 529         return buf;
 530 }
 531
 532
 533 static struct wpabuf * eap_fast_tlv_pac_ack(void)
 534 {
 535         struct wpabuf *buf;
 536         struct eap_tlv_result_tlv *res;
 537         struct eap_tlv_pac_ack_tlv *ack;
 538
 539         buf = wpabuf_alloc(sizeof(*res) + sizeof(*ack));
 540         if (buf == NULL)
 541                 return NULL;
 542
 543         wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV (ack)");
 544         ack = wpabuf_put(buf, sizeof(*ack));
 545         ack->tlv_type = host_to_be16(EAP_TLV_PAC_TLV |
 546                                      EAP_TLV_TYPE_MANDATORY);
 547         ack->length = host_to_be16(sizeof(*ack) - sizeof(struct eap_tlv_hdr));
 548         ack->pac_type = host_to_be16(PAC_TYPE_PAC_ACKNOWLEDGEMENT);
 549         ack->pac_len = host_to_be16(2);
 550         ack->result = host_to_be16(EAP_TLV_RESULT_SUCCESS);
 551
 552         return buf;
 553 }
 554
 555
 556 static struct wpabuf * eap_fast_process_eap_payload_tlv(
 557         struct eap_sm *sm, struct eap_fast_data *data,
 558         struct eap_method_ret *ret,
 559         u8 *eap_payload_tlv, size_t eap_payload_tlv_len)
 560 {
 561         struct eap_hdr *hdr;
 562         struct wpabuf *resp = NULL;
 563
 564         if (eap_payload_tlv_len < sizeof(*hdr)) {
 565                 wpa_printf(MSG_DEBUG, "EAP-FAST: too short EAP "
 566                            "Payload TLV (len=%lu)",
 567                            (unsigned long) eap_payload_tlv_len);
 568                 return NULL;
 569         }
 570
 571         hdr = (struct eap_hdr *) eap_payload_tlv;
 572         if (be_to_host16(hdr->length) > eap_payload_tlv_len) {
 573                 wpa_printf(MSG_DEBUG, "EAP-FAST: EAP packet overflow in "
 574                            "EAP Payload TLV");
 575                 return NULL;
 576         }
 577
 578         if (hdr->code != EAP_CODE_REQUEST) {
 579                 wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
 580                            "Phase 2 EAP header", hdr->code);
 581                 return NULL;
 582         }
 583
 584         if (eap_fast_phase2_request(sm, data, ret, hdr, &resp)) {
 585                 wpa_printf(MSG_INFO, "EAP-FAST: Phase2 Request processing "
 586                            "failed");
 587                 return NULL;
 588         }
 589
 590         return eap_fast_tlv_eap_payload(resp);
 591 }
 592
 593
 594 static int eap_fast_validate_crypto_binding(
 595         struct eap_tlv_crypto_binding_tlv *_bind)
 596 {
 597         wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV: Version %d "
 598                    "Received Version %d SubType %d",
 599                    _bind->version, _bind->received_version, _bind->subtype);
 600         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 601                     _bind->nonce, sizeof(_bind->nonce));
 602         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 603                     _bind->compound_mac, sizeof(_bind->compound_mac));
 604
 605         if (_bind->version != EAP_FAST_VERSION ||
 606             _bind->received_version != EAP_FAST_VERSION ||
 607             _bind->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST) {
 608                 wpa_printf(MSG_INFO, "EAP-FAST: Invalid version/subtype in "
 609                            "Crypto-Binding TLV: Version %d "
 610                            "Received Version %d SubType %d",
 611                            _bind->version, _bind->received_version,
 612                            _bind->subtype);
 613                 return -1;
 614         }
 615
 616         return 0;
 617 }
 618
 619
 620 static void eap_fast_write_crypto_binding(
 621         struct eap_tlv_crypto_binding_tlv *rbind,
 622         struct eap_tlv_crypto_binding_tlv *_bind, const u8 *cmk)
 623 {
 624         rbind->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
 625                                        EAP_TLV_CRYPTO_BINDING_TLV);
 626         rbind->length = host_to_be16(sizeof(*rbind) -
 627                                      sizeof(struct eap_tlv_hdr));
 628         rbind->version = EAP_FAST_VERSION;
 629         rbind->received_version = _bind->version;
 630         rbind->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE;
 631         os_memcpy(rbind->nonce, _bind->nonce, sizeof(_bind->nonce));
 632         inc_byte_array(rbind->nonce, sizeof(rbind->nonce));
 633         hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) rbind, sizeof(*rbind),
 634                   rbind->compound_mac);
 635
 636         wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: Version %d "
 637                    "Received Version %d SubType %d",
 638                    rbind->version, rbind->received_version, rbind->subtype);
 639         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
 640                     rbind->nonce, sizeof(rbind->nonce));
 641         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
 642                     rbind->compound_mac, sizeof(rbind->compound_mac));
 643 }
 644
 645
 646 static int eap_fast_get_phase2_key(struct eap_sm *sm,
 647                                    struct eap_fast_data *data,
 648                                    u8 *isk, size_t isk_len)
 649 {
 650         u8 *key;
 651         size_t key_len;
 652
 653         os_memset(isk, 0, isk_len);
 654
 655         if (data->phase2_method == NULL || data->phase2_priv == NULL) {
 656                 wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
 657                            "available");
 658                 return -1;
 659         }
 660
 661         if (data->phase2_method->isKeyAvailable == NULL ||
 662             data->phase2_method->getKey == NULL)
 663                 return 0;
 664
 665         if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
 666             (key = data->phase2_method->getKey(sm, data->phase2_priv,
 667                                                &key_len)) == NULL) {
 668                 wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
 669                            "from Phase 2");
 670                 return -1;
 671         }
 672
 673         if (key_len > isk_len)
 674                 key_len = isk_len;
 675         if (key_len == 32 &&
 676             data->phase2_method->vendor == EAP_VENDOR_IETF &&
 677             data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
 678                 /*
 679                  * EAP-FAST uses reverse order for MS-MPPE keys when deriving
 680                  * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
 681                  * ISK for EAP-FAST cryptobinding.
 682                  */
 683                 os_memcpy(isk, key + 16, 16);
 684                 os_memcpy(isk + 16, key, 16);
 685         } else
 686                 os_memcpy(isk, key, key_len);
 687         os_free(key);
 688
 689         return 0;
 690 }
 691
 692
 693 static int eap_fast_get_cmk(struct eap_sm *sm, struct eap_fast_data *data,
 694                             u8 *cmk)
 695 {
 696         u8 isk[32], imck[60];
 697
 698         wpa_printf(MSG_DEBUG, "EAP-FAST: Determining CMK[%d] for Compound MIC "
 699                    "calculation", data->simck_idx + 1);
 700
 701         /*
 702          * RFC 4851, Section 5.2:
 703          * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
 704          *                 MSK[j], 60)
 705          * S-IMCK[j] = first 40 octets of IMCK[j]
 706          * CMK[j] = last 20 octets of IMCK[j]
 707          */
 708
 709         if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
 710                 return -1;
 711         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
 712         if (sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
 713                        "Inner Methods Compound Keys",
 714                        isk, sizeof(isk), imck, sizeof(imck)) < 0)
 715                 return -1;
 716         data->simck_idx++;
 717         os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
 718         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
 719                         data->simck, EAP_FAST_SIMCK_LEN);
 720         os_memcpy(cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
 721         wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
 722                         cmk, EAP_FAST_CMK_LEN);
 723
 724         return 0;
 725 }
 726
 727
 728 static u8 * eap_fast_write_pac_request(u8 *pos, u16 pac_type)
 729 {
 730         struct eap_tlv_hdr *pac;
 731         struct eap_tlv_request_action_tlv *act;
 732         struct eap_tlv_pac_type_tlv *type;
 733
 734         act = (struct eap_tlv_request_action_tlv *) pos;
 735         act->tlv_type = host_to_be16(EAP_TLV_REQUEST_ACTION_TLV);
 736         act->length = host_to_be16(2);
 737         act->action = host_to_be16(EAP_TLV_ACTION_PROCESS_TLV);
 738
 739         pac = (struct eap_tlv_hdr *) (act + 1);
 740         pac->tlv_type = host_to_be16(EAP_TLV_PAC_TLV);
 741         pac->length = host_to_be16(sizeof(*type));
 742
 743         type = (struct eap_tlv_pac_type_tlv *) (pac + 1);
 744         type->tlv_type = host_to_be16(PAC_TYPE_PAC_TYPE);
 745         type->length = host_to_be16(2);
 746         type->pac_type = host_to_be16(pac_type);
 747
 748         return (u8 *) (type + 1);
 749 }
 750
 751
 752 static struct wpabuf * eap_fast_process_crypto_binding(
 753         struct eap_sm *sm, struct eap_fast_data *data,
 754         struct eap_method_ret *ret,
 755         struct eap_tlv_crypto_binding_tlv *_bind, size_t bind_len)
 756 {
 757         struct wpabuf *resp;
 758         u8 *pos;
 759         u8 cmk[EAP_FAST_CMK_LEN], cmac[SHA1_MAC_LEN];
 760         int res;
 761         size_t len;
 762
 763         if (eap_fast_validate_crypto_binding(_bind) < 0)
 764                 return NULL;
 765
 766         if (eap_fast_get_cmk(sm, data, cmk) < 0)
 767                 return NULL;
 768
 769         /* Validate received Compound MAC */
 770         os_memcpy(cmac, _bind->compound_mac, sizeof(cmac));
 771         os_memset(_bind->compound_mac, 0, sizeof(cmac));
 772         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for Compound "
 773                     "MAC calculation", (u8 *) _bind, bind_len);
 774         hmac_sha1(cmk, EAP_FAST_CMK_LEN, (u8 *) _bind, bind_len,
 775                   _bind->compound_mac);
 776         res = os_memcmp_const(cmac, _bind->compound_mac, sizeof(cmac));
 777         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Received Compound MAC",
 778                     cmac, sizeof(cmac));
 779         wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Calculated Compound MAC",
 780                     _bind->compound_mac, sizeof(cmac));
 781         if (res != 0) {
 782                 wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not match");
 783                 os_memcpy(_bind->compound_mac, cmac, sizeof(cmac));
 784                 return NULL;
 785         }
 786
 787         /*
 788          * Compound MAC was valid, so authentication succeeded. Reply with
 789          * crypto binding to allow server to complete authentication.
 790          */
 791
 792         len = sizeof(struct eap_tlv_crypto_binding_tlv);
 793         resp = wpabuf_alloc(len);
 794         if (resp == NULL)
 795                 return NULL;
 796
 797         if (!data->anon_provisioning && data->phase2_success &&
 798             eap_fast_derive_msk(data) < 0) {
 799                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to generate MSK");
 800                 ret->methodState = METHOD_DONE;
 801                 ret->decision = DECISION_FAIL;
 802                 data->phase2_success = 0;
 803                 wpabuf_free(resp);
 804                 return NULL;
 805         }
 806
 807         if (!data->anon_provisioning && data->phase2_success) {
 808                 os_free(data->session_id);
 809                 data->session_id = eap_peer_tls_derive_session_id(
 810                         sm, &data->ssl, EAP_TYPE_FAST, &data->id_len);
 811                 if (data->session_id) {
 812                         wpa_hexdump(MSG_DEBUG, "EAP-FAST: Derived Session-Id",
 813                                     data->session_id, data->id_len);
 814                 } else {
 815                         wpa_printf(MSG_ERROR, "EAP-FAST: Failed to derive "
 816                                    "Session-Id");
 817                         wpabuf_free(resp);
 818                         return NULL;
 819                 }
 820         }
 821
 822         pos = wpabuf_put(resp, sizeof(struct eap_tlv_crypto_binding_tlv));
 823         eap_fast_write_crypto_binding((struct eap_tlv_crypto_binding_tlv *)
 824                                       pos, _bind, cmk);
 825
 826         return resp;
 827 }
 828
 829
 830 static void eap_fast_parse_pac_tlv(struct eap_fast_pac *entry, int type,
 831                                    u8 *pos, size_t len, int *pac_key_found)
 832 {
 833         switch (type & 0x7fff) {
 834         case PAC_TYPE_PAC_KEY:
 835                 wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key", pos, len);
 836                 if (len != EAP_FAST_PAC_KEY_LEN) {
 837                         wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid PAC-Key "
 838                                    "length %lu", (unsigned long) len);
 839                         break;
 840                 }
 841                 *pac_key_found = 1;
 842                 os_memcpy(entry->pac_key, pos, len);
 843                 break;
 844         case PAC_TYPE_PAC_OPAQUE:
 845                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque", pos, len);
 846                 entry->pac_opaque = pos;
 847                 entry->pac_opaque_len = len;
 848                 break;
 849         case PAC_TYPE_PAC_INFO:
 850                 wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info", pos, len);
 851                 entry->pac_info = pos;
 852                 entry->pac_info_len = len;
 853                 break;
 854         default:
 855                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC type %d",
 856                            type);
 857                 break;
 858         }
 859 }
 860
 861
 862 static int eap_fast_process_pac_tlv(struct eap_fast_pac *entry,
 863                                     u8 *pac, size_t pac_len)
 864 {
 865         struct pac_tlv_hdr *hdr;
 866         u8 *pos;
 867         size_t left, len;
 868         int type, pac_key_found = 0;
 869
 870         pos = pac;
 871         left = pac_len;
 872
 873         while (left > sizeof(*hdr)) {
 874                 hdr = (struct pac_tlv_hdr *) pos;
 875                 type = be_to_host16(hdr->type);
 876                 len = be_to_host16(hdr->len);
 877                 pos += sizeof(*hdr);
 878                 left -= sizeof(*hdr);
 879                 if (len > left) {
 880                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV overrun "
 881                                    "(type=%d len=%lu left=%lu)",
 882                                    type, (unsigned long) len,
 883                                    (unsigned long) left);
 884                         return -1;
 885                 }
 886
 887                 eap_fast_parse_pac_tlv(entry, type, pos, len, &pac_key_found);
 888
 889                 pos += len;
 890                 left -= len;
 891         }
 892
 893         if (!pac_key_found || !entry->pac_opaque || !entry->pac_info) {
 894                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV does not include "
 895                            "all the required fields");
 896                 return -1;
 897         }
 898
 899         return 0;
 900 }
 901
 902
 903 static int eap_fast_parse_pac_info(struct eap_fast_pac *entry, int type,
 904                                    u8 *pos, size_t len)
 905 {
 906         u16 pac_type;
 907         u32 lifetime;
 908         struct os_time now;
 909
 910         switch (type & 0x7fff) {
 911         case PAC_TYPE_CRED_LIFETIME:
 912                 if (len != 4) {
 913                         wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Info - "
 914                                     "Invalid CRED_LIFETIME length - ignored",
 915                                     pos, len);
 916                         return 0;
 917                 }
 918
 919                 /*
 920                  * This is not currently saved separately in PAC files since
 921                  * the server can automatically initiate PAC update when
 922                  * needed. Anyway, the information is available from PAC-Info
 923                  * dump if it is needed for something in the future.
 924                  */
 925                 lifetime = WPA_GET_BE32(pos);
 926                 os_get_time(&now);
 927                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - CRED_LIFETIME %d "
 928                            "(%d days)",
 929                            lifetime, (lifetime - (u32) now.sec) / 86400);
 930                 break;
 931         case PAC_TYPE_A_ID:
 932                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID",
 933                                   pos, len);
 934                 entry->a_id = pos;
 935                 entry->a_id_len = len;
 936                 break;
 937         case PAC_TYPE_I_ID:
 938                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - I-ID",
 939                                   pos, len);
 940                 entry->i_id = pos;
 941                 entry->i_id_len = len;
 942                 break;
 943         case PAC_TYPE_A_ID_INFO:
 944                 wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: PAC-Info - A-ID-Info",
 945                                   pos, len);
 946                 entry->a_id_info = pos;
 947                 entry->a_id_info_len = len;
 948                 break;
 949         case PAC_TYPE_PAC_TYPE:
 950                 /* RFC 5422, Section 4.2.6 - PAC-Type TLV */
 951                 if (len != 2) {
 952                         wpa_printf(MSG_INFO, "EAP-FAST: Invalid PAC-Type "
 953                                    "length %lu (expected 2)",
 954                                    (unsigned long) len);
 955                         wpa_hexdump_ascii(MSG_DEBUG,
 956                                           "EAP-FAST: PAC-Info - PAC-Type",
 957                                           pos, len);
 958                         return -1;
 959                 }
 960                 pac_type = WPA_GET_BE16(pos);
 961                 if (pac_type != PAC_TYPE_TUNNEL_PAC &&
 962                     pac_type != PAC_TYPE_USER_AUTHORIZATION &&
 963                     pac_type != PAC_TYPE_MACHINE_AUTHENTICATION) {
 964                         wpa_printf(MSG_INFO, "EAP-FAST: Unsupported PAC Type "
 965                                    "%d", pac_type);
 966                         return -1;
 967                 }
 968
 969                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info - PAC-Type %d",
 970                            pac_type);
 971                 entry->pac_type = pac_type;
 972                 break;
 973         default:
 974                 wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored unknown PAC-Info "
 975                            "type %d", type);
 976                 break;
 977         }
 978
 979         return 0;
 980 }
 981
 982
 983 static int eap_fast_process_pac_info(struct eap_fast_pac *entry)
 984 {
 985         struct pac_tlv_hdr *hdr;
 986         u8 *pos;
 987         size_t left, len;
 988         int type;
 989
 990         /* RFC 5422, Section 4.2.4 */
 991
 992         /* PAC-Type defaults to Tunnel PAC (Type 1) */
 993         entry->pac_type = PAC_TYPE_TUNNEL_PAC;
 994
 995         pos = entry->pac_info;
 996         left = entry->pac_info_len;
 997         while (left > sizeof(*hdr)) {
 998                 hdr = (struct pac_tlv_hdr *) pos;
 999                 type = be_to_host16(hdr->type);
1000                 len = be_to_host16(hdr->len);
1001                 pos += sizeof(*hdr);
1002                 left -= sizeof(*hdr);
1003                 if (len > left) {
1004                         wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info overrun "
1005                                    "(type=%d len=%lu left=%lu)",
1006                                    type, (unsigned long) len,
1007                                    (unsigned long) left);
1008                         return -1;
1009                 }
1010
1011                 if (eap_fast_parse_pac_info(entry, type, pos, len) < 0)
1012                         return -1;
1013
1014                 pos += len;
1015                 left -= len;
1016         }
1017
1018         if (entry->a_id == NULL || entry->a_id_info == NULL) {
1019                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Info does not include "
1020                            "all the required fields");
1021                 return -1;
1022         }
1023
1024         return 0;
1025 }
1026
1027
1028 static struct wpabuf * eap_fast_process_pac(struct eap_sm *sm,
1029                                             struct eap_fast_data *data,
1030                                             struct eap_method_ret *ret,
1031                                             u8 *pac, size_t pac_len)
1032 {
1033         struct eap_peer_config *config = eap_get_config(sm);
1034         struct eap_fast_pac entry;
1035
1036         os_memset(&entry, 0, sizeof(entry));
1037         if (eap_fast_process_pac_tlv(&entry, pac, pac_len) ||
1038             eap_fast_process_pac_info(&entry))
1039                 return NULL;
1040
1041         eap_fast_add_pac(&data->pac, &data->current_pac, &entry);
1042         eap_fast_pac_list_truncate(data->pac, data->max_pac_list_len);
1043         if (data->use_pac_binary_format)
1044                 eap_fast_save_pac_bin(sm, data->pac, config->pac_file);
1045         else
1046                 eap_fast_save_pac(sm, data->pac, config->pac_file);
1047
1048         if (data->provisioning) {
1049                 if (data->anon_provisioning) {
1050                         /*
1051                          * Unauthenticated provisioning does not provide keying
1052                          * material and must end with an EAP-Failure.
1053                          * Authentication will be done separately after this.
1054                          */
1055                         data->success = 0;
1056                         ret->decision = DECISION_FAIL;
1057                 } else {
1058                         /*
1059                          * Server may or may not allow authenticated
1060                          * provisioning also for key generation.
1061                          */
1062                         ret->decision = DECISION_COND_SUCC;
1063                 }
1064                 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1065                            "- Provisioning completed successfully");
1066                 sm->expected_failure = 1;
1067         } else {
1068                 /*
1069                  * This is PAC refreshing, i.e., normal authentication that is
1070                  * expected to be completed with an EAP-Success. However,
1071                  * RFC 5422, Section 3.5 allows EAP-Failure to be sent even
1072                  * after protected success exchange in case of EAP-Fast
1073                  * provisioning, so we better use DECISION_COND_SUCC here
1074                  * instead of DECISION_UNCOND_SUCC.
1075                  */
1076                 wpa_printf(MSG_DEBUG, "EAP-FAST: Send PAC-Acknowledgement TLV "
1077                            "- PAC refreshing completed successfully");
1078                 ret->decision = DECISION_COND_SUCC;
1079         }
1080         ret->methodState = METHOD_DONE;
1081         return eap_fast_tlv_pac_ack();
1082 }
1083
1084
1085 static int eap_fast_parse_decrypted(struct wpabuf *decrypted,
1086                                     struct eap_fast_tlv_parse *tlv,
1087                                     struct wpabuf **resp)
1088 {
1089         int mandatory, tlv_type, res;
1090         size_t len;
1091         u8 *pos, *end;
1092
1093         os_memset(tlv, 0, sizeof(*tlv));
1094
1095         /* Parse TLVs from the decrypted Phase 2 data */
1096         pos = wpabuf_mhead(decrypted);
1097         end = pos + wpabuf_len(decrypted);
1098         while (end - pos > 4) {
1099                 mandatory = pos[0] & 0x80;
1100                 tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1101                 pos += 2;
1102                 len = WPA_GET_BE16(pos);
1103                 pos += 2;
1104                 if (len > (size_t) (end - pos)) {
1105                         wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1106                         return -1;
1107                 }
1108                 wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1109                            "TLV type %d length %u%s",
1110                            tlv_type, (unsigned int) len,
1111                            mandatory ? " (mandatory)" : "");
1112
1113                 res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1114                 if (res == -2)
1115                         break;
1116                 if (res < 0) {
1117                         if (mandatory) {
1118                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1119                                            "mandatory TLV type %d", tlv_type);
1120                                 *resp = eap_fast_tlv_nak(0, tlv_type);
1121                                 break;
1122                         } else {
1123                                 wpa_printf(MSG_DEBUG, "EAP-FAST: ignored "
1124                                            "unknown optional TLV type %d",
1125                                            tlv_type);
1126                         }
1127                 }
1128
1129                 pos += len;
1130         }
1131
1132         return 0;
1133 }
1134
1135
1136 static int eap_fast_encrypt_response(struct eap_sm *sm,
1137                                      struct eap_fast_data *data,
1138                                      struct wpabuf *resp,
1139                                      u8 identifier, struct wpabuf **out_data)
1140 {
1141         if (resp == NULL)
1142                 return 0;
1143
1144         wpa_hexdump_buf(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 data",
1145                         resp);
1146         if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1147                                  data->fast_version, identifier,
1148                                  resp, out_data)) {
1149                 wpa_printf(MSG_INFO, "EAP-FAST: Failed to encrypt a Phase 2 "
1150                            "frame");
1151         }
1152         wpabuf_free(resp);
1153
1154         return 0;
1155 }
1156
1157
1158 static struct wpabuf * eap_fast_pac_request(void)
1159 {
1160         struct wpabuf *tmp;
1161         u8 *pos, *pos2;
1162
1163         tmp = wpabuf_alloc(sizeof(struct eap_tlv_hdr) +
1164                            sizeof(struct eap_tlv_request_action_tlv) +
1165                            sizeof(struct eap_tlv_pac_type_tlv));
1166         if (tmp == NULL)
1167                 return NULL;
1168
1169         pos = wpabuf_put(tmp, 0);
1170         pos2 = eap_fast_write_pac_request(pos, PAC_TYPE_TUNNEL_PAC);
1171         wpabuf_put(tmp, pos2 - pos);
1172         return tmp;
1173 }
1174
1175
1176 static int eap_fast_process_decrypted(struct eap_sm *sm,
1177                                       struct eap_fast_data *data,
1178                                       struct eap_method_ret *ret,
1179                                       u8 identifier,
1180                                       struct wpabuf *decrypted,
1181                                       struct wpabuf **out_data)
1182 {
1183         struct wpabuf *resp = NULL, *tmp;
1184         struct eap_fast_tlv_parse tlv;
1185         int failed = 0;
1186
1187         if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0)
1188                 return 0;
1189         if (resp)
1190                 return eap_fast_encrypt_response(sm, data, resp,
1191                                                  identifier, out_data);
1192
1193         if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1194                 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1195                 return eap_fast_encrypt_response(sm, data, resp,
1196                                                  identifier, out_data);
1197         }
1198
1199         if (tlv.iresult == EAP_TLV_RESULT_FAILURE) {
1200                 resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
1201                 return eap_fast_encrypt_response(sm, data, resp,
1202                                                  identifier, out_data);
1203         }
1204
1205         if (tlv.crypto_binding) {
1206                 tmp = eap_fast_process_crypto_binding(sm, data, ret,
1207                                                       tlv.crypto_binding,
1208                                                       tlv.crypto_binding_len);
1209                 if (tmp == NULL)
1210                         failed = 1;
1211                 else
1212                         resp = wpabuf_concat(resp, tmp);
1213         }
1214
1215         if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) {
1216                 tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE :
1217                                           EAP_TLV_RESULT_SUCCESS, 1);
1218                 resp = wpabuf_concat(resp, tmp);
1219         }
1220
1221         if (tlv.eap_payload_tlv) {
1222                 tmp = eap_fast_process_eap_payload_tlv(
1223                         sm, data, ret, tlv.eap_payload_tlv,
1224                         tlv.eap_payload_tlv_len);
1225                 resp = wpabuf_concat(resp, tmp);
1226         }
1227
1228         if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) {
1229                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV "
1230                            "acknowledging success");
1231                 failed = 1;
1232         } else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) {
1233                 tmp = eap_fast_process_pac(sm, data, ret, tlv.pac,
1234                                            tlv.pac_len);
1235                 resp = wpabuf_concat(resp, tmp);
1236         }
1237
1238         if (data->current_pac == NULL && data->provisioning &&
1239             !data->anon_provisioning && !tlv.pac &&
1240             (tlv.iresult == EAP_TLV_RESULT_SUCCESS ||
1241              tlv.result == EAP_TLV_RESULT_SUCCESS)) {
1242                 /*
1243                  * Need to request Tunnel PAC when using authenticated
1244                  * provisioning.
1245                  */
1246                 wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC");
1247                 tmp = eap_fast_pac_request();
1248                 resp = wpabuf_concat(resp, tmp);
1249         }
1250
1251         if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) {
1252                 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0);
1253                 resp = wpabuf_concat(tmp, resp);
1254         } else if (failed) {
1255                 tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
1256                 resp = wpabuf_concat(tmp, resp);
1257         }
1258
1259         if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed &&
1260             tlv.crypto_binding && data->phase2_success) {
1261                 if (data->anon_provisioning) {
1262                         wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated "
1263                                    "provisioning completed successfully.");
1264                         ret->methodState = METHOD_DONE;
1265                         ret->decision = DECISION_FAIL;
1266                         sm->expected_failure = 1;
1267                 } else {
1268                         wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1269                                    "completed successfully.");
1270                         if (data->provisioning)
1271                                 ret->methodState = METHOD_MAY_CONT;
1272                         else
1273                                 ret->methodState = METHOD_DONE;
1274                         ret->decision = DECISION_UNCOND_SUCC;
1275                 }
1276         }
1277
1278         if (resp == NULL) {
1279                 wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send "
1280                            "empty response packet");
1281                 resp = wpabuf_alloc(1);
1282         }
1283
1284         return eap_fast_encrypt_response(sm, data, resp, identifier,
1285                                          out_data);
1286 }
1287
1288
1289 static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data,
1290                             struct eap_method_ret *ret, u8 identifier,
1291                             const struct wpabuf *in_data,
1292                             struct wpabuf **out_data)
1293 {
1294         struct wpabuf *in_decrypted;
1295         int res;
1296
1297         wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1298                    " Phase 2", (unsigned long) wpabuf_len(in_data));
1299
1300         if (data->pending_phase2_req) {
1301                 wpa_printf(MSG_DEBUG, "EAP-FAST: Pending Phase 2 request - "
1302                            "skip decryption and use old data");
1303                 /* Clear TLS reassembly state. */
1304                 eap_peer_tls_reset_input(&data->ssl);
1305
1306                 in_decrypted = data->pending_phase2_req;
1307                 data->pending_phase2_req = NULL;
1308                 goto continue_req;
1309         }
1310
1311         if (wpabuf_len(in_data) == 0) {
1312                 /* Received TLS ACK - requesting more fragments */
1313                 return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
1314                                             data->fast_version,
1315                                             identifier, NULL, out_data);
1316         }
1317
1318         res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
1319         if (res)
1320                 return res;
1321
1322 continue_req:
1323         wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)",
1324                         in_decrypted);
1325
1326         if (wpabuf_len(in_decrypted) < 4) {
1327                 wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1328                            "TLV frame (len=%lu)",
1329                            (unsigned long) wpabuf_len(in_decrypted));
1330                 wpabuf_free(in_decrypted);
1331                 return -1;
1332         }
1333
1334         res = eap_fast_process_decrypted(sm, data, ret, identifier,
1335                                          in_decrypted, out_data);
1336
1337         wpabuf_free(in_decrypted);
1338
1339         return res;
1340 }
1341
1342
1343 static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len)
1344 {
1345         const u8 *a_id;
1346         const struct pac_tlv_hdr *hdr;
1347
1348         /*
1349          * Parse authority identity (A-ID) from the EAP-FAST/Start. This
1350          * supports both raw A-ID and one inside an A-ID TLV.
1351          */
1352         a_id = buf;
1353         *id_len = len;
1354         if (len > sizeof(*hdr)) {
1355                 int tlen;
1356                 hdr = (const struct pac_tlv_hdr *) buf;
1357                 tlen = be_to_host16(hdr->len);
1358                 if (be_to_host16(hdr->type) == PAC_TYPE_A_ID &&
1359                     sizeof(*hdr) + tlen <= len) {
1360                         wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV "
1361                                    "(Start)");
1362                         a_id = (const u8 *) (hdr + 1);
1363                         *id_len = tlen;
1364                 }
1365         }
1366         wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len);
1367
1368         return a_id;
1369 }
1370
1371
1372 static void eap_fast_select_pac(struct eap_fast_data *data,
1373                                 const u8 *a_id, size_t a_id_len)
1374 {
1375         data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len,
1376                                              PAC_TYPE_TUNNEL_PAC);
1377         if (data->current_pac == NULL) {
1378                 /*
1379                  * Tunnel PAC was not available for this A-ID. Try to use
1380                  * Machine Authentication PAC, if one is available.
1381                  */
1382                 data->current_pac = eap_fast_get_pac(
1383                         data->pac, a_id, a_id_len,
1384                         PAC_TYPE_MACHINE_AUTHENTICATION);
1385         }
1386
1387         if (data->current_pac) {
1388                 wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID "
1389                            "(PAC-Type %d)", data->current_pac->pac_type);
1390                 wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info",
1391                                   data->current_pac->a_id_info,
1392                                   data->current_pac->a_id_info_len);
1393         }
1394 }
1395
1396
1397 static int eap_fast_use_pac_opaque(struct eap_sm *sm,
1398                                    struct eap_fast_data *data,
1399                                    struct eap_fast_pac *pac)
1400 {
1401         u8 *tlv;
1402         size_t tlv_len, olen;
1403         struct eap_tlv_hdr *ehdr;
1404
1405         olen = pac->pac_opaque_len;
1406         tlv_len = sizeof(*ehdr) + olen;
1407         tlv = os_malloc(tlv_len);
1408         if (tlv) {
1409                 ehdr = (struct eap_tlv_hdr *) tlv;
1410                 ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE);
1411                 ehdr->length = host_to_be16(olen);
1412                 os_memcpy(ehdr + 1, pac->pac_opaque, olen);
1413         }
1414         if (tlv == NULL ||
1415             tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1416                                             TLS_EXT_PAC_OPAQUE,
1417                                             tlv, tlv_len) < 0) {
1418                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS "
1419                            "extension");
1420                 os_free(tlv);
1421                 return -1;
1422         }
1423         os_free(tlv);
1424
1425         return 0;
1426 }
1427
1428
1429 static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm,
1430                                          struct eap_fast_data *data)
1431 {
1432         if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
1433                                             TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) {
1434                 wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque "
1435                            "TLS extension");
1436                 return -1;
1437         }
1438         return 0;
1439 }
1440
1441
1442 static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm,
1443                                              struct eap_fast_data *data)
1444 {
1445         u8 ciphers[7];
1446         int count = 0;
1447
1448         if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) {
1449                 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated "
1450                            "provisioning TLS cipher suites");
1451                 ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA;
1452         }
1453
1454         if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) {
1455                 wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated "
1456                            "provisioning TLS cipher suites");
1457                 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES256_SHA;
1458                 ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA;
1459                 ciphers[count++] = TLS_CIPHER_AES256_SHA;
1460                 ciphers[count++] = TLS_CIPHER_AES128_SHA;
1461                 ciphers[count++] = TLS_CIPHER_RC4_SHA;
1462         }
1463
1464         ciphers[count++] = TLS_CIPHER_NONE;
1465
1466         if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
1467                                            ciphers)) {
1468                 wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS "
1469                            "cipher suites for provisioning");
1470                 return -1;
1471         }
1472
1473         return 0;
1474 }
1475
1476
1477 static int eap_fast_process_start(struct eap_sm *sm,
1478                                   struct eap_fast_data *data, u8 flags,
1479                                   const u8 *pos, size_t left)
1480 {
1481         const u8 *a_id;
1482         size_t a_id_len;
1483
1484         /* EAP-FAST Version negotiation (section 3.1) */
1485         wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)",
1486                    flags & EAP_TLS_VERSION_MASK, data->fast_version);
1487         if ((flags & EAP_TLS_VERSION_MASK) < data->fast_version)
1488                 data->fast_version = flags & EAP_TLS_VERSION_MASK;
1489         wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d",
1490                    data->fast_version);
1491
1492         a_id = eap_fast_get_a_id(pos, left, &a_id_len);
1493         eap_fast_select_pac(data, a_id, a_id_len);
1494
1495         if (data->resuming && data->current_pac) {
1496                 wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - "
1497                            "do not add PAC-Opaque to TLS ClientHello");
1498                 if (eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1499                         return -1;
1500         } else if (data->current_pac) {
1501                 /*
1502                  * PAC found for the A-ID and we are not resuming an old
1503                  * session, so add PAC-Opaque extension to ClientHello.
1504                  */
1505                 if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0)
1506                         return -1;
1507         } else {
1508                 /* No PAC found, so we must provision one. */
1509                 if (!data->provisioning_allowed) {
1510                         wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and "
1511                                    "provisioning disabled");
1512                         return -1;
1513                 }
1514                 wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - "
1515                            "starting provisioning");
1516                 if (eap_fast_set_provisioning_ciphers(sm, data) < 0 ||
1517                     eap_fast_clear_pac_opaque_ext(sm, data) < 0)
1518                         return -1;
1519                 data->provisioning = 1;
1520         }
1521
1522         return 0;
1523 }
1524
1525
1526 static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
1527                                         struct eap_method_ret *ret,
1528                                         const struct wpabuf *reqData)
1529 {
1530         const struct eap_hdr *req;
1531         size_t left;
1532         int res;
1533         u8 flags, id;
1534         struct wpabuf *resp;
1535         const u8 *pos;
1536         struct eap_fast_data *data = priv;
1537         struct wpabuf msg;
1538
1539         pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret,
1540                                         reqData, &left, &flags);
1541         if (pos == NULL)
1542                 return NULL;
1543
1544         req = wpabuf_head(reqData);
1545         id = req->identifier;
1546
1547         if (flags & EAP_TLS_FLAGS_START) {
1548                 if (eap_fast_process_start(sm, data, flags, pos, left) < 0)
1549                         return NULL;
1550
1551                 left = 0; /* A-ID is not used in further packet processing */
1552         }
1553
1554         wpabuf_set(&msg, pos, left);
1555
1556         resp = NULL;
1557         if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
1558             !data->resuming) {
1559                 /* Process tunneled (encrypted) phase 2 data. */
1560                 res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp);
1561                 if (res < 0) {
1562                         ret->methodState = METHOD_DONE;
1563                         ret->decision = DECISION_FAIL;
1564                         /*
1565                          * Ack possible Alert that may have caused failure in
1566                          * decryption.
1567                          */
1568                         res = 1;
1569                 }
1570         } else {
1571                 if (sm->waiting_ext_cert_check && data->pending_resp) {
1572                         struct eap_peer_config *config = eap_get_config(sm);
1573
1574                         if (config->pending_ext_cert_check ==
1575                             EXT_CERT_CHECK_GOOD) {
1576                                 wpa_printf(MSG_DEBUG,
1577                                            "EAP-FAST: External certificate check succeeded - continue handshake");
1578                                 resp = data->pending_resp;
1579                                 data->pending_resp = NULL;
1580                                 sm->waiting_ext_cert_check = 0;
1581                                 return resp;
1582                         }
1583
1584                         if (config->pending_ext_cert_check ==
1585                             EXT_CERT_CHECK_BAD) {
1586                                 wpa_printf(MSG_DEBUG,
1587                                            "EAP-FAST: External certificate check failed - force authentication failure");
1588                                 ret->methodState = METHOD_DONE;
1589                                 ret->decision = DECISION_FAIL;
1590                                 sm->waiting_ext_cert_check = 0;
1591                                 return NULL;
1592                         }
1593
1594                         wpa_printf(MSG_DEBUG,
1595                                    "EAP-FAST: Continuing to wait external server certificate validation");
1596                         return NULL;
1597                 }
1598
1599                 /* Continue processing TLS handshake (phase 1). */
1600                 res = eap_peer_tls_process_helper(sm, &data->ssl,
1601                                                   EAP_TYPE_FAST,
1602                                                   data->fast_version, id, &msg,
1603                                                   &resp);
1604                 if (res < 0) {
1605                         wpa_printf(MSG_DEBUG,
1606                                    "EAP-FAST: TLS processing failed");
1607                         ret->methodState = METHOD_DONE;
1608                         ret->decision = DECISION_FAIL;
1609                         return resp;
1610                 }
1611
1612                 if (sm->waiting_ext_cert_check) {
1613                         wpa_printf(MSG_DEBUG,
1614                                    "EAP-FAST: Waiting external server certificate validation");
1615                         wpabuf_free(data->pending_resp);
1616                         data->pending_resp = resp;
1617                         return NULL;
1618                 }
1619
1620                 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
1621                         char cipher[80];
1622                         wpa_printf(MSG_DEBUG,
1623                                    "EAP-FAST: TLS done, proceed to Phase 2");
1624                         if (data->provisioning &&
1625                             (!(data->provisioning_allowed &
1626                                EAP_FAST_PROV_AUTH) ||
1627                              tls_get_cipher(sm->ssl_ctx, data->ssl.conn,
1628                                             cipher, sizeof(cipher)) < 0 ||
1629                              os_strstr(cipher, "ADH-") ||
1630                              os_strstr(cipher, "anon"))) {
1631                                 wpa_printf(MSG_DEBUG, "EAP-FAST: Using "
1632                                            "anonymous (unauthenticated) "
1633                                            "provisioning");
1634                                 data->anon_provisioning = 1;
1635                         } else
1636                                 data->anon_provisioning = 0;
1637                         data->resuming = 0;
1638                         if (eap_fast_derive_keys(sm, data) < 0) {
1639                                 wpa_printf(MSG_DEBUG,
1640                                            "EAP-FAST: Could not derive keys");
1641                                 ret->methodState = METHOD_DONE;
1642                                 ret->decision = DECISION_FAIL;
1643                                 wpabuf_free(resp);
1644                                 return NULL;
1645                         }
1646                 }
1647
1648                 if (res == 2) {
1649                         /*
1650                          * Application data included in the handshake message.
1651                          */
1652                         wpabuf_free(data->pending_phase2_req);
1653                         data->pending_phase2_req = resp;
1654                         resp = NULL;
1655                         res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp);
1656                 }
1657         }
1658
1659         if (res == 1) {
1660                 wpabuf_free(resp);
1661                 return eap_peer_tls_build_ack(id, EAP_TYPE_FAST,
1662                                               data->fast_version);
1663         }
1664
1665         return resp;
1666 }
1667
1668
1669 #if 0 /* FIX */
1670 static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv)
1671 {
1672         struct eap_fast_data *data = priv;
1673         return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
1674 }
1675
1676
1677 static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv)
1678 {
1679         struct eap_fast_data *data = priv;
1680         os_free(data->key_block_p);
1681         data->key_block_p = NULL;
1682         wpabuf_free(data->pending_phase2_req);
1683         data->pending_phase2_req = NULL;
1684         wpabuf_free(data->pending_resp);
1685         data->pending_resp = NULL;
1686 }
1687
1688
1689 static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv)
1690 {
1691         struct eap_fast_data *data = priv;
1692         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
1693                 os_free(data);
1694                 return NULL;
1695         }
1696         os_memset(data->key_data, 0, EAP_FAST_KEY_LEN);
1697         os_memset(data->emsk, 0, EAP_EMSK_LEN);
1698         os_free(data->session_id);
1699         data->session_id = NULL;
1700         if (data->phase2_priv && data->phase2_method &&
1701             data->phase2_method->init_for_reauth)
1702                 data->phase2_method->init_for_reauth(sm, data->phase2_priv);
1703         data->phase2_success = 0;
1704         data->resuming = 1;
1705         data->provisioning = 0;
1706         data->anon_provisioning = 0;
1707         data->simck_idx = 0;
1708         return priv;
1709 }
1710 #endif
1711
1712
1713 static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf,
1714                                size_t buflen, int verbose)
1715 {
1716         struct eap_fast_data *data = priv;
1717         int len, ret;
1718
1719         len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
1720         if (data->phase2_method) {
1721                 ret = os_snprintf(buf + len, buflen - len,
1722                                   "EAP-FAST Phase2 method=%s\n",
1723                                   data->phase2_method->name);
1724                 if (os_snprintf_error(buflen - len, ret))
1725                         return len;
1726                 len += ret;
1727         }
1728         return len;
1729 }
1730
1731
1732 static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv)
1733 {
1734         struct eap_fast_data *data = priv;
1735         return data->success;
1736 }
1737
1738
1739 static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1740 {
1741         struct eap_fast_data *data = priv;
1742         u8 *key;
1743
1744         if (!data->success)
1745                 return NULL;
1746
1747         key = os_malloc(EAP_FAST_KEY_LEN);
1748         if (key == NULL)
1749                 return NULL;
1750
1751         *len = EAP_FAST_KEY_LEN;
1752         os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN);
1753
1754         return key;
1755 }
1756
1757
1758 static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1759 {
1760         struct eap_fast_data *data = priv;
1761         u8 *id;
1762
1763         if (!data->success || !data->session_id)
1764                 return NULL;
1765
1766         id = os_malloc(data->id_len);
1767         if (id == NULL)
1768                 return NULL;
1769
1770         *len = data->id_len;
1771         os_memcpy(id, data->session_id, data->id_len);
1772
1773         return id;
1774 }
1775
1776
1777 static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1778 {
1779         struct eap_fast_data *data = priv;
1780         u8 *key;
1781
1782         if (!data->success)
1783                 return NULL;
1784
1785         key = os_malloc(EAP_EMSK_LEN);
1786         if (key == NULL)
1787                 return NULL;
1788
1789         *len = EAP_EMSK_LEN;
1790         os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1791
1792         return key;
1793 }
1794
1795
1796 int eap_peer_fast_register(void)
1797 {
1798         struct eap_method *eap;
1799
1800         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1801                                     EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1802         if (eap == NULL)
1803                 return -1;
1804
1805         eap->init = eap_fast_init;
1806         eap->deinit = eap_fast_deinit;
1807         eap->process = eap_fast_process;
1808         eap->isKeyAvailable = eap_fast_isKeyAvailable;
1809         eap->getKey = eap_fast_getKey;
1810         eap->getSessionId = eap_fast_get_session_id;
1811         eap->get_status = eap_fast_get_status;
1812 #if 0
1813         eap->has_reauth_data = eap_fast_has_reauth_data;
1814         eap->deinit_for_reauth = eap_fast_deinit_for_reauth;
1815         eap->init_for_reauth = eap_fast_init_for_reauth;
1816 #endif
1817         eap->get_emsk = eap_fast_get_emsk;
1818
1819         return eap_peer_method_register(eap);
1820 }